Drilling tool



Patented UNITED' STATES Pa'riezNT OFFICE.

GEORGE DORNES, JR., OF LONG- ISLAND CITY, NEW YORK.A

This invention relates drills and ed to make holes in glass, ilar materials.

Heretofore the has been a ing a high of breakin One object provide a may be ea time.

vide a tool drilling de by ordinary d thereof by means of breast-dril A furth which the DRILLING- TOOL.

Application filed March 2, 1926. Serial No. 91,711.

more particularly slow and to improvements in to drills adaptporeelain and simdrilling of such materials laborious process involvdegrce of uncertainty and danger g the material bei of the present tool with which ng drilled.

invention is to these materials sily and safely drilled in a short in the connecting the same with by iotating the shank a hand bit-brace or rill press or Another object of the invention is to proform of a compactportable operated either a spindle of an er object is to provide a drillin axis of the cutting tool is 1nclined to the surface of the work is provided.

rEhe invention w from the f nection iv work and given a planetary motion whereby a sufficient clearance between the cutting tool and the ill be fully understood ollowing description taken in conith pended claims.

In the dra-wings, Fig. 1 is of my improved Fig. 9. i

s a side elevation form of cutting tool or drill.

Fig. 3 is a cross-sec ting tool or drill.

Fig. e is a cross-sectional of drilled ly the shape of drill.

In the preferred vention shown in dicates a holder having shank 2 adapted plate dle of drill press and to be If desirable, the shank with a square or upper end whereby an ordinary lower part of the holder 1 is axial hole in which a shaft 3 a cylindrical screw 4.

is securely held by a set other tional view to be inserted 2 may be provide shaped section at its it may be inserted into hand brace for turning.

the accompanying drawings d out in the apa side elevation drilling tool.

of a preferred of the cutview of a piece glass showing approximatethe hole produced by the embodiment of the in- 1, the numeral 1 ina standard tapered into the spinrotated thereby.

he providedA with A handle 5, freely movable with respect to the shaft 3, is provided to prevent a portion of the apparatus hereinafter described from rotating.

A bevelled gear 7 with respect to which the shaft 3 may rotate freely is positioned justbelow the handle 5 and is fastened thereto preferably by a pin 6. A collar 8, rotatable with the shaft 3, prevents upward movement of the handle 5 along this shaft.

A yoke 9 terniinatinor in two substantially cylindrical portions forming beai'ings 10 and 11 inclined to each other7 is fixed to the shaft 3 by means of a pin 1Q and a shaft 13 is rotatably carried in the outer cylindrical portion 11. A bevelled gear 151 is keyed or otherwise fastened at the upper end of this shaft 13, and is in mesh with the bevelled gear 7.

- The cylindrical bearing 10 prevents downward movement of the gear 7 The handle 5 and the gear 7 thus constitute a stationary part of the apparatus.

A chuck 15 is attached to the lower end of the shaft 13 and is adapted to hold the cutting tool 16. The preferred form of tool is an elongated piece of tool steel or similar material of triangular cross-section having its end bevelled to a three sided point, as illustrated in Figs. 1 and 2. It is obvious, however, that cutting tools of various crosssections having similar cutting edges may be used With this apparatus.

It has been found that the best results in drilling are accomplished when the point of the tool 16 lies on the projected axis of the shaft 3, as shown in'Fig. 1.

' The operation of the drill may be briefly described as follows:

The shank 2 is inserted into a correspondingly tapered hole in the spindle of a drill press. Thebevelled gear 7 is held in a fixed position by the handle 5 while a rotary motion is given to the shank 2, causing the outer bearing 11 of the yoke 9 and its appurtenances to revolve about the axis of the shaft 3, giving the tool 16 an orbital rotation. As the gears 7 and 14 are in mesh, the shaft 13 and consequently the cutting tool 16 will d have an additional rotation about their own axis. A suitable fluid such as turpentine 1s usei to facilitate the cutting action of the too As shown in Fig. 4, the hole drilled is countersunk at both faces ofthe glass thus permitting screws or other fastening devices to lie flush with the surface of the glass. This form of hole is produced byV cutting the hole half way through the material and then reversing the material so that the hole is tinished from the opposite side. After reversal for holding said member stationary when the hole may be enlarged as desired. said shank rotates.

In the form shown in the drawings, the 2. A glass drilling tool comprising, a cutting tool 16 revolves twice as fast about shank adapted to engage the spindle of a its axis as does the shank 2 about its axis, drill press or similar rotating device, a yoke due to the revolutions of the planetary gear rigidly attached to said shank and provided .about the aXis of the spindle of the drill with an inclined bearing at its outer end, a

press. The edges of the drill are made to shaft rotatably mounted in said bearing, a approach and recede fromv the surface being chuck carried by the lower end of sald shaft, out and move along epicycloidal curves which a gear carried by the upper end of said shaft, assure sufiicient clearance for the tool during a gear rotatably mounted on said shank and 40 the cutting operation. engaging said first mentioned gear and prol Obviously, the ratio between the gears 7 vided with a handle to hold the same staand 14 may be changed if desired and the intionary. y clined spindle 13 may be rotated by other 3. A glass drilling tool comprising, a

lmeans connected with the shaft?) without deshank adapted to engage the spindle of a parting from the spirit of my invention. drill press or similar rotatino' device, a yoke l claim: rigidly attached to said shank and provided 1. A lass drilling tool comprising, a with an inclined bearing at its outer end, a shank a apted to engage the spindle of a shaft rotatably mounted in said bearing, a drill press or similar rotating device, a yoke beveled gear mounted on'the outer end of 50 rigidly attached to said shank and provided said shaft, a triangular, pointed drill carwith an inclined bearing at its outer end, ried by the lower end of said shaft, a beveled a shaft rotatably mounted in said bearing, gear rotatably mounted on said shank and means at the upper end of said shaft for roengaging the first mentioned gear, and a tating the same, a chuck carried by the lower handle fixed to last named gear for holding end of said shaft, a member rotatably carthe same stationary. ried by said shank for'causing a planetary i motion of said rotating means, and a handle GEORGE DORNES, JR. 

